he's not saying that you can't work a 9-5 as a linux admin, he's saying that you can't work a 9-5 job as a linux admin if you don't know what you're doing.

he's not saying that you can't work a 9-5 as a linux admin, he's saying that you can't work a 9-5 job as a linux admin if you don't know what you're doing. Your lack of knowledge would quickly be exposed, whereas Windows systems/networks will allow itself to be set up completely wrong and still at least function to some extent.